http://www.securityfocus.com/brief/888

A computer forensics specialist has a message for security-minded computer users: A single wipe will make drives impossible to read.

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"Although there is a good chance of recovery for any individual bit from a drive, the chances of recovery of any amount of data from a drive using an electron microscope are negligible," Wright stated. "The fallacy that data can be forensically recovered using an electron microscope or related means needs to be put to rest."
Found this article linked on Slashdot ... What do you guys think? Are multiple wipes/rewrites a waste of time?